white tank as living space

Good evening,

I have an offer for a [weiße Wanne], 10m x 10m, over €50,000.

I want to use part of the basement as an office and bathroom. I have researched online, and accordingly, the whole thing would need to be insulated.

1. What exactly can I expect?
2. Does this insulation need to be done from the outside or the inside?
3. The [Weiße Wanne] is basically completely waterproof. If you live there, how does the moisture that a person exhales get out again? Do you also have to install a ventilation system?
4. Approximately how much would all of this cost extra? €1,000, €10,000 ...?

Thank you for your help

With us, the additional costs for a house with 90 sqm of built-up area are around €18,000. This includes insulation, heating, floor ceiling height increase, as well as [Kontrollierte-Wohnraumlüftung] connection.

Our basement has also been designed as a living basement, additional costs amount to over 30k euros.

This includes

External insulation
Internal insulation
Controlled residential ventilation
Pipes under plaster "in the basement surface-mounted normal"
Underfloor heating
Windows
Etc..

Hi, the question of additional costs depends on the basic standard you start from. A [weiße Wanne] should actually have insulation anyway, otherwise you'll have a cold dripstone cave down there. We have 10 cm perimeter insulation and that's more than enough. For a finished room height, you should have at least 2.25 m for an office. Normal 2.5 m is of course nicer, but also costs more. As a rough estimate, you can calculate about 150-200 € per cm. If you already have a controlled residential ventilation system, the additional costs to connect the basement are marginal. You should do it anyway, whether it's a residential basement or not. If you have planned without a controlled residential ventilation system so far, that naturally means directly 10-20 k€. Heating will cost you another 4-5 k€ for the basement. Pipes should be installed in the interior walls under plaster anyway, regardless of whether it’s a residential basement or not. Important: at the exterior walls of a [weiße Wanne], you actually can’t lay pipes under plaster. Chiseling into the concrete is not a good idea. Best regards, Andreas

[PQUOTE="andimann, post: 162083, member: 25961"]Pipes should be embedded in the interior walls anyway, whether it's a living basement or not.[/PQUOTE] Depending on who builds your basement, the interior walls may also be made of concrete. With Glatthaar, you can have empty conduits installed in advance for an additional charge. However, if the interior walls are masonry, flush mounting is of course no problem.

Depending on who builds your basement, the interior walls can also be made of concrete.

Sure, that exists too (and given the election results this morning, it’s probably not a bad idea to convert the basement into a bunker). With the providers I talked to, however, it was always the case that with a white tank the inside was made of bricks. So it seemed to me to be more common...

Best regards,

Andreas